Abstract
The medicinal compound antifebrin was prepared in the laboratory via one stage (green method) by using aniline, glacial acetic acid, and zinc dust. The investigation was aimed at ascertain a possibility of utilizing the medicinal compound to originate a corrosion inhibitor for Al in a 3 M HCl solution. In the present article, the usefulness of antifebrin to inhibit the Al corrosion in 3 M HCl solution was examined by the Tafel plot, AC impedance spectroscopy, gasometric and quantum chemical techniques. The Tafel plot results show that concentration of antifebrin has a positive effect on the inhibition efficiency. The Tafel plot also reveals that this medicinal compound inhibits the acidic corrosion of aluminum by a mixed mode. Impedance spectroscopy results show that corrosion resistance of Al in a 3 M hydrochloric acid was improved by antifebrin. For better understanding the relationship between the antifebrin molecular structure and inhibitory ability, quantum calculations (by using Argus Lab = latest version) were performed. Surface studies were carried out by scanning electron microscopy. The Langmuir plot confirms the chemical adsorption mechanism on the Al surface in a 3 M HCl solution in the presence of antifebrin.
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